On Mon, Jul 11, 2011 at 11:39 PM, Dan Williams <[email protected]> wrote:
> On Mon, Jul 11, 2011 at 2:28 AM, Linus Walleij <[email protected]>
> wrote:
> ...and I suspect the slave device drivers that use TI DMA are not
> expected to ever work with other dmaengines? Likely the case, but
> just wondering out loud.
Typically the OMAP/TI drivers are one-to-one with this specific DMA
controller, but they *can* support controllers without stride options, and
notice that striding will only be used for the display driver IIRC,
pseudo-code:
ret = dmaengine_device_control(chan, TI_DMA_STRIDE_CONFIG,
(unsigned long) &my_stride_config);
if (ret) {
/*
* OK no striding on this DMA engine, fall back to something else,
* such as creating an SGlist which emulates the striding with one
* sglist element per stride.
*/
}
By injecting an error in the stride config path this can even be
properly tested. So it will become an optional acceleration.
Thanks,
Linus Walleij
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